<template>
  <div class="wrapper">
    <v-head></v-head>
    <v-sidebar></v-sidebar>
    <div class="content-box" :class="{ 'content-collapse': collapse }">
      <v-tags></v-tags>
      <div class="content">
        <transition name="move" mode="out-in">
          <div>
            <keep-alive :max="20">
              <router-view v-if="$route.meta.keepAlive"></router-view>
            </keep-alive>
            <router-view v-if="!$route.meta.keepAlive"></router-view>
          </div>
        </transition>
      </div>
    </div>
  </div>
</template>

<script>
import vHead from "./Header.vue";
import vSidebar from "./Sidebar.vue";
import vTags from "./Tags.vue";
import bus from "./bus";
export default {
  data() {
    return {
      tagsList: [],
      collapse: false,
    };
  },
  components: {
    vHead,
    vSidebar,
    vTags,
  },
  created() {
    bus.$on("collapse", (msg) => {
      this.collapse = msg;
    });

    // 只有在标签页列表里的页面才使用keep-alive，即关闭标签之后就不保存到内存中了。
    bus.$on("tags", (msg) => {
      let arr = [];
      for (let i = 0, len = msg.length; i < len; i++) {
        msg[i].name && arr.push(msg[i].name);
      }
      this.tagsList = arr;
    });
  },
};
</script>

<style scoped>
  
.wrapper {
  width: 100%;
  height: 100%;
  overflow: hidden;
}
</style>
